add previous post

fet2020/posts/views.py

@@ -202,6 +202,7 @@ def show(request, id=None):
         "author": author,
         "author_image": author_image,
         "next": __next(post, public_only),
+        "previous": get_previous_dict(p),
         "related_posts": related_posts[0:6],
         "ep_agenda_link": ep_agenda_link,
         "ep_protocol_link": ep_protocol_link,
@@ -282,3 +283,27 @@ def __next(post=None, public=True):
                 break
 
     return d
+
+
+def get_previous_dict(post=None):
+    # TODO: Docstring
+    posts = None
+    d = post.slug
+
+    if post:
+        # TODO: bad implementation but it works!!
+        if post.post_type == "N" or post.post_type == "E":
+            posts = Post.articles.get_visible_articles()
+        elif post.post_type == "F":
+            posts = FetMeeting.objects.get_queryset().order_by("-event_start")
+
+    if posts:
+        for k, v in enumerate(posts):
+            if post.slug == v.slug:
+                if k < 1:
+                    d = posts[len(posts) - 1].slug
+                else:
+                    d = posts[k - 1].slug
+                break
+
+    return d